SEOUL, Nov. 2 (Yonhap) -- An Army non-commissioned officer was killed and another officer injured when a light attack helicopter made an emergency landing southeast of Seoul during an exercise, the South Korean military said Wednesday.

An official said an MD 500 helicopter made the emergency landing around 2:30 p.m. during the annual Hoguk Exercise in Wonju, Gangwon Province, some 130 kilometers southeast of Seoul. A warrant officer named Hong died of unspecified injuries while being treated at a military hospital. The co-pilot, a major surnamed Cho, sustained a broken leg.

The official said the cause of the incident has not been determined and added that the tail section of the helicopter had been damaged.

"The chopper was hovering as part of an air strike drill during the exercise," the official said. "We have grounded all MD 500 helicopters as of 3:40 p.m. today."

The Hoguk Exercise got underway on Oct. 27 and is scheduled to end this Friday. It involves all branches of the service.